Which factor influences the choice between P100 and N95 respirators?

• A. The presence of oil aerosols in the environment
• B. The color of the respirator
• C. The worker's height
• D. The time of day

Answer: (B)

Oil aerosols present a key factor in deciding between P100 and N95 respirators. N95s filter particles but are not oil resistant, so exposure to oil-based aerosols can reduce their filtration efficiency over time. P100 respirators use an oil-proof filter medium, maintaining high filtration performance even when oil aerosols are present. Therefore, when oil aerosols are anticipated, choose a P100. In environments with only non-oil aerosols, an N95 is usually sufficient. Other details like the color of the respirator, the worker’s height, or the time of day don’t affect filtration performance.